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Maslennikova, A.; Larionov, P.; Ryabchun, S.; Smirnov, A.; Pentin, I.; Vakhtomin, Yu.; Smirnov, K.; Kaurova, N.; Voronov, B.; Goltsman, G. |
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Noise equivalent power and dynamic range of NBN hot-electron bolometers |
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Conference Article |
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2011 |
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Proc. MLPLIT |
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Proc. MLPLIT |
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146-148 |
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NbN HEB |
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Suzdal / Vladimir (Russia) |
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Modern laser physics and laser-information technologies for science and manufacture |
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1st international russian-chinese conference / youthschool-workshop |
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September 23-28, 2011 |
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1386 |
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Bylander, Jonas; Gustavsson, Simon; Yan, Fei; Yoshihara, Fumiki; Harrabi, Khalil; Fitch, George; Cory, David G.; Nakamura, Yasunobu; Tsai, Jaw-Shen; Oliver, William D. |
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Title |
Noise spectroscopy through dynamical decoupling with a superconducting flux qubit |
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Journal Article |
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2011 |
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Nature Physics |
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Nat. Phys. |
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7 |
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7 |
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565-570 |
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fromIPMRAS |
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Quantum coherence in natural and artificial spin systems is fundamental to applications ranging from quantum information science to magnetic-resonance imaging and identification. Several multipulse control sequences targeting generalized noise models have been developed to extend coherence by dynamically decoupling a spin system from its noisy environment. In any particular implementation, however, the efficacy of these methods is sensitive to the specific frequency distribution of the noise, suggesting that these same pulse sequences could also be used to probe the noise spectrum directly. Here we demonstrate noise spectroscopy by means of dynamical decoupling using a superconducting qubit with energy-relaxation time T1=12μs. We first demonstrate that dynamical decoupling improves the coherence time T2 in this system up to the T2=2T1 limit (pure dephasing times exceeding 100μs), and then leverage its filtering properties to probe the environmental noise over a frequency (f) range 0.2-20MHz, observing a 1/fα distribution with α<1. The characterization of environmental noise has broad utility for spin-resonance applications, enabling the design of optimized coherent-control methods, promoting device and materials engineering, and generally improving coherence. |
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RPLAB @ gujma @ |
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829 |
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Author |
Lupascu, Adrian |
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Title |
Nonlinear dynamics: Quantum pendula locked in |
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2011 |
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Nature Physics |
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Nat. Phys. |
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7 |
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2 |
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100-101 |
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A study of the autoresonant behaviour of a superconducting pendulum reveals that quantum fluctuations determine only the initial oscillator motion and not its subsequent dynamics. This could be important in the development of more efficient methods for reading solid-state qubits. |
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840 |
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Buchanan, Mark |
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Nothing's impossible |
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2011 |
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Nature Physics |
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Nat. Phys. |
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7 |
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5 |
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RPLAB @ gujma @ |
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839 |
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Author |
Fazal, Furqan M.; Block, Steven M. |
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Title |
Optical tweezers study life under tension |
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2011 |
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Nature Photonics |
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Nat. Photon. |
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5 |
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6 |
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318-321 |
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Optical tweezers have become one of the primary weapons in the arsenal of biophysicists, and have revolutionized the new field of single-molecule biophysics. Today's techniques allow high-resolution experiments on biological macromolecules that were mere pipe dreams only a decade ago. |
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RPLAB @ gujma @ |
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776 |
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